This is always up for debate... but i say 3600-3700 lbs... im sure someone can get more exact or correct...
There is a 25lb weight in the pass fender under the wheel well to start.... take that out... the x brace for the K weighs quite a bit.... its a drop top.... AC can go.... Rear seat delete... Alum DS/flywheel/rims reduces rotational weight...... Tube K members are always nice gives you some more room for long tubes....
There is always aluminum heads
Also remember its not always about loosing weight.... repositioning weight to the rear can help... move the battery... it cleans up the bay and puts some more weight over the rear wheels.